The levels should be a little longer than SM3DL, but I'd also like to see the game have as many power ups (or more) as NSMB Wii. If the main power ups are only Fire Flower, Raccoon Suit/Tanooki and one other (like SM3DL), I'll be disappointed. Super Skills videos should make a return, too, those were awesome.

OH please . sm3dl was not that long, actually it was one of the shortest( it depends on how much time it took you in completing the special worlds)
I want it to be longer than sm3dl, AND PLEASE MAKE IT A BIT MORE DIFFICULT!. There was absolutely no point of lives in sm3dl. Other than that everything is tried and tested so dont change it much, and yeah i would love dlc worlds

It needs to be harder. Mario games are FAR too easy these days, and the new super mario bros hack that someone did for the DS was awesome, a little unforgiving in places but it was way more fun that the official game.

I would also like to see levels that change slightly, not big changes but lets say sometimes enemies spawn in diffrent places, in one run of a level the 1st pipe would take you to a shortcut room, in another playthrough of the same level its the 2nd pipe. I think little changes like that would make my next idea awesome...

Time trials for speed runs of levels, that you can compare online with other people, i think combined with levels that change slightly each time it would make it alot better for competition online for the fastest time.

I kinda get the feeling that if there will be multiplayer, it would be strictly local with the possible exception of online play with only those on your friend list. The Wii version, while competitive to a point, also involved cooperation. I'd imagine so many jerks simply wanting to get a stiffy by messing you up and not actually play the game.

Possibility to save after every level. Removal of 1Ups/Lives (pointless anyway, since you get unlimited continues), but overall more difficult levels.

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True for the 1Ups, except maybe in a multiplayer scenario, where one can die, but the game keeps going like with NSMBWii if any more players are still up.

Difficulty-wise, I would also like it more difficult, but they have to take into account that not everyone wants it to be too difficult. They already made strides with the guides things that allows invincibility throughout the level or simply skip to the end. Only thing I could imagine is the frequency of enemies and harmful objects, as the levels themselves would most likely not change.

Maybe some kinda difficulty option like easy, normal, hard. If you chose easy then there wouldn't be as many enemies and there would be changes to the level so it would be easier and on like hard there would be harder jumps to make and the hidden coins harder to get or something. That way the game could truly appeal to all gamers. And for added replay value you would have to play through all the difficulties for perhaps special worlds or in-game collectibles. That would make the game much longer.

I'd like if the levels were more open-ended in design flow like NSMB Wii, the DS version kept with being like the original Super Mario Bros in that there's next to no vertical scrolling on a LOT of the levels.

I'm not expecting anything particularly innovative or fresh here, but still something fun to pick up and play.

Possibility to save after every level. Removal of 1Ups/Lives (pointless anyway, since you get unlimited continues), but overall more difficult levels.

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1-Ups are still useful for the 2D Mario games as if you get a Game Over, you have to start the World over again. So the ability to save after every level would kinda be stupid, because there's no challenge in that. But when it comes to the 3D games, I agree. They're pointless.